package com.neu.filter;

import com.neu.utils.JwtUtils;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
@WebFilter(urlPatterns = {"/*"})
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取到请求路径
        String requestURI = request.getRequestURI();      //URI不包含协议IP和端口 /employee/login
        //2.判断是否是登录请求，如果路径中包含/login，说明是登录操作，放行
        if (requestURI.contains("/login")) {
            log.info("登录请求，放行");
            filterChain.doFilter(request, response);
            return;
        }
        //3.获取请求头中的token
        String token = request.getHeader("token");

        //4.判断token是否存在，如果不存在，说明用户没有登录，返回错误信息（响应401状态码）
        if (token == null || token.isEmpty()) {
            log.info("令牌为空，响应401");
            response.setStatus(401);
            return;
        }

        //5.如果token存在，检验令牌，如果校验失败 ->返回错误信息（响应401状态码）
        try {
            JwtUtils.parseToken(token);
        } catch (Exception e) {
            log.info("令牌非法，响应401");
            response.setStatus(401);
            return;
        }

        //6.校验成功，放行
        log.info("令牌合法，放行");
        filterChain.doFilter(request, response);


    }
}
